Method of making boron and boron alloys.



' Unrrnn s'rArzEs PATENT onnron;

EZECHIEL WEINTRAUB, OF LYNN, MASSACHUSETTS, .ASSIGNOR T GENERAL ELEC- TRIO COMPANY, A QORPORATION OF NEW YORK.

METHOD OF MAKING BORON AND BORON ALLOYS.

Specification of Letters Patent.

Patented Mar. 5, 1912.

No Drawing. Original application filed October 27, 1909, Serial No. 524,950. Divided and this application filed October 5, 1910.

i To all whom it may concern:

' of reducing the production of bodies consisting of'boron Be it known that I, 'EZECHIEL VVEIN- TRAUB, a citizen of the United States, re siding at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Methods of Making Boron and Boron Alloys, (division of my application filed October 27, 1909, Serial No. 52L,950,) of which the following is a specification. v

My presentinvention involves a method boron'from its compounds and associated with small amounts of another element, such as carbon.

In an application, Serial No. 346,253, filed by me December 4, 1906, I have described the production of pure fused boron and have indicated various uses for it in the arts. As described by me in that application, and at more length in my application Serial No. 524,939, filed Oct. 27, 1909, pure fused boron is a fair conductor of electricity and has an enormous negative temperature resistance co-efiicient. The peculiar properties of boron can be utilized in various applications in the arts, as for example, in pyrometers, wireless telegraphy and as a material for dies, jewels and drills. In some cases, the boron may be associated to advantage with a small amount of another element, such as carbon. The addition of a small amount of carbon increases'the initial conductivity of the boron and lowers its extreme negative temperature resistance coefficient to an extent depending upon the amount of carbon added. For example, a few tenths of a per cent. of carbon may vary the resistance tenfold. In certain cases this effect is desirable. In a similar manner thepresence of a small amount of carbon will modify the Wear-resisting qualities of the boron when used as a bearing or die.

According to the present method of making boron containing a small percentage of carbon, a carbon filament is heated to in- Serial No. 585,390.

carbon is desired, the deposition is continued until a relatively thick rod of boron has been formed. During this process, espe- (*ially if the'temperature is raised considerably, the carbon diffuses through the mass of boron. If a perfectly homogeneous product is desired, the mass is fused. down in an are by methods described in my co-pending application, Serial No. 524,947. As the carbon filament has a very small mass, and the deposit of boron can be made quite thick if desired, the percentage of carbon in the final product'may be made practically as small as desired. If it is desired to produce thick rods with a higher percentage of carbon, the carbon is deposited simultaneously with the boron by adding to the mixture of boron chlorid and hydrogen a vaporized carbon compound, such as gasolene or carbointetrachlorid. The actual proportions used depend, of course, upon the amount of carbon desired in the final product. I find that boron chlorid and gasolene are completely miscible, and therefore can be mixed in liquid form and vaporized at the desired rate either by dropping into ayessel which is somewhat heated, carrying the vapor off with a stream of hydrogen, or by merely passing the hydrogen gas over the mixture. I

In the parentapplication, of which this is a division, claims are made on boron associated with a small amount of another element, such as carbon.

\Vhat I claim as new and desireto secure by Letters Patent of'the United States, is,-

1. The process which consists in bringliquid ing amixture containing boron halid and reducing gas into contact with a heated surface thereby depositing boron thereon.

2. The method of coating a conductor, which consists in heating the conductor in a mixture containing boron chlorid and reducing gas.

3. The process which consists in bringing a gaseous mixture containing boron chlorid vapor and hydrogen into contactwith an incandescent surface thereby depositing boron on the surface.

4. The process which consists in incandescing a carbon conductor in a mixture conin subjecting the surface to a mixture com- 13 taining boron ohlorid and hydrogen to deprising boron chlorid, hydrogen and gasoposit boron on the surface of said conductor. lene.

5. The process of depositing boron and In witness whereof, I have hereunto'set 5 carbon on a heated surface which consists my hand this 3rd day'of October, 1910.

in subjecting the surface to a mixture of EZECH [EL WEINTRAUB. boron halid, hydrogen and a hydrocarbon. Witnesses:

6. The process of depositing boron and. JOHN A. 'MoMnNUs, Jr.,

' carbon on a heated surface which-consists Y FRANK G. TTA'rrIE. 

